What are some examples of async middleware in Node.js?

What are some examples of async middleware in Node.js?

Async middleware in Node.js allows you to handle asynchronous operations in your routes. Examples include using async/await with Express.js.

Can you show me a code example of async middleware?

Sure! Here's a simple example:

const express = require('express');
const app = express();

const asyncMiddleware = async (req, res, next) => {
    try {
        // Simulate an async operation
        const data = await someAsyncFunction();
        req.data = data;
        next();
    } catch (error) {
        next(error);
    }
};

app.use(asyncMiddleware);
app.get('/', (req, res) => {
    res.send(req.data);
});

What happens if the async operation fails?

If the async operation fails, the error will be caught in the catch block, and you can pass it to the next middleware for error handling.

Are there any best practices for using async middleware?

Yes, some best practices include always handling errors, keeping middleware functions small, and using proper logging.